Remanufactured Manifold Catalyst Durability?

[CaduTwo]

Hello,

2006 M45 new Infiniti owner here. I recently had a sensor failure which triggered an engine shutoff and flooded the cats. The sensor was covered under warranty but the cat lights that came on shortly after are not. There seem to be a few options for ordering the replacement parts(14002CG200 and 14002CG210) - through the dealer, Infinitipartsusa.com, orderinfinitiparts.com, infinitipartszone.com, parts.infinitiusa.com(official), or parts.com. Infinitipartsusa.com specifically states that theirs is a remanufactured part, certified by Infiniti, while the other sites charge about $50-200 less but say something like "This Genuine Factory Manifold", " The Original Equipment Manufacturer or OEM part", but I haven't seen the word "new" anywhere. Are the other part manufacturers also likely to be selling remanufactured manifold/cats but not explicitly stating it? I'd like to keep the car as long as possible, and it currently has 112k miles on it.

Is there a significant long term lifespan advantage to purchasing a new manifold cat vs a remanufactured one? I know that they get very hot so am concerned about long term cracking with a remanufactured part, however, if the catalyst section, which is the same piece attached to the manifold for the V8 VK45 engines, has something like 80-100k mile life expectancy and the manifold has 2-300k, then it wouldn't matter since you'd be replacing it for cat failure before manifold failure anyway. I have asked these questions to the support at the parts sites, but none have responded for a few days.

Any input is greatly appreciated, and thank you very much for creating this community which was a great help choosing the two cars for my family.

[Ilya]

I would not say there is an advantage. You just get a break on price, typically, with reman units because they are technically 'used'. I'd go that route without hesitation.

[CaduTwo]

Thanks for the quick response. Do you know if it's normal for parts dealers to not list if things are remanufactured or not? I thought it was strange that many sites(all that I've seen so far) show the part with an MSRP of $506, some with a $140 core charge added on top of that, some with that $140 included so $366. Infinitipartsusa.com charges $573, including the $140 core charge so $433, but explicitly state remanufactured. The forums here seem to recommend infinitipartsusa.com often, so it seems strange to me that all of the others don't say new or remanufatured but charge about $70 less.

Also in case anyone comes across this thread, the left exhaust manifold part # has been updated from 14002CG200 to 14002CG20A and the right is still 14002CG210.

Thanks again.